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Finding the Fourth Proportional to 438.31, 656.43 and 243.01

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Solution

The fourth proportional to 438.31, 656.43 and 243.01 is: 363.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.31 : 656.43 = 243.01 : x
  2. Step 2: Convert to fraction form
    438.31/656.43 = 243.01/x
  3. Step 3: Cross multiply
    438.31x = 656.43 × 243.01
  4. Step 4: Simplify right side
    438.31x = 159,519.05
  5. Step 5: Solve for x
    x = 159,519.05/438.31
  6. Step 6: Final answer
    x = 363.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.